I am surely not alone who accidentally overwrote an armory slot by pressing R and confirming instead of E. At the moment, there is a very weak safeguard against this but both E and R lead to a very similar pop up and in the hazzle one might miss to read it properly. And bam! You just have overwritten your armory slot with another configuration instead of equipping it.
So I suggest to be able to reset it to the previous configuration as long as you do it within one session of your character in order to avoid unnecessary data storage need. It should be possible to quickly realize the mistake and revert it to the previous setting so I don't think it is a big issue to limit it to the present login session.
Thanks and best regards!